He retired in the early 1970s. His memoirs described the C-Day fiasco in more detail than had previously been given to the British public. He credited the Doctor for the successful resolution of the crisis. He described the Doctor as an English gentleman in his early sixties with "imperious white hair swept back from his face and reaching almost to collar length, with haughty features and piercing eyes that burned with intelligence and wit." (PROSE: Who Killed Kennedy)